中国物理B ›› 2016, Vol. 25 ›› Issue (7): 73202-073202.doi: 10.1088/1674-1056/25/7/073202

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Two-photon double ionization of helium by chirped few-cycle attosecond pulses: From nonsequential to sequential regime

Yao Tong(童瑶), Wei-Chao Jiang(姜维超), Pan Wu(伍攀), Liang-You Peng(彭良友)   

  1. 1 State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China;
    2 Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria;
    3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2016-02-26 修回日期:2016-05-09 出版日期:2016-07-05 发布日期:2016-07-05
  • 通讯作者: Liang-You Peng E-mail:liangyou.peng@pku.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11322437 and 11574010) and the National Basic Research Project of China (Grant No. 2013CB922402).

Two-photon double ionization of helium by chirped few-cycle attosecond pulses: From nonsequential to sequential regime

Yao Tong(童瑶)1, Wei-Chao Jiang(姜维超)1,2, Pan Wu(伍攀)1, Liang-You Peng(彭良友)1,3   

  1. 1 State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China;
    2 Institute for Theoretical Physics, Vienna University of Technology, Wiedner Hauptstraße 8-10, A-1040 Vienna, Austria;
    3 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • Received:2016-02-26 Revised:2016-05-09 Online:2016-07-05 Published:2016-07-05
  • Contact: Liang-You Peng E-mail:liangyou.peng@pku.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11322437 and 11574010) and the National Basic Research Project of China (Grant No. 2013CB922402).

摘要:

The two-photon double ionization (TPDI) dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schrödinger equation in its full dimensions. We show that both the differential and the total double ionization probability can be significantly controlled by adjusting the chirp. The dependence of the TPDI on the chirp can be quite different for different photon energies, relying on the central photon energy being in the sequential region, nonsequential region, or translation region. The physics which lead to the chirp dependence for different photon energies are addressed. Present findings are well reproduced by a model based on the second-order time-dependent perturbation theory.

关键词: time-dependent Schrö, dinger equation (TDSE), double ionization, electron correlation, chirp

Abstract:

The two-photon double ionization (TPDI) dynamics of helium by chirped attosecond pulses are theoretically studied by solving the two-electron time-dependent Schrödinger equation in its full dimensions. We show that both the differential and the total double ionization probability can be significantly controlled by adjusting the chirp. The dependence of the TPDI on the chirp can be quite different for different photon energies, relying on the central photon energy being in the sequential region, nonsequential region, or translation region. The physics which lead to the chirp dependence for different photon energies are addressed. Present findings are well reproduced by a model based on the second-order time-dependent perturbation theory.

Key words: time-dependent Schrö, dinger equation (TDSE), double ionization, electron correlation, chirp

中图分类号:  (Multiphoton ionization and excitation to highly excited states)

  • 32.80.Rm
42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift) 42.65.Re (Ultrafast processes; optical pulse generation and pulse compression)